irqchips/bmips: Add bcm6345-l1 interrupt controller

Add the BCM6345 interrupt controller based on the SMP-capable BCM7038
and the BCM3380 but with packed interrupt registers.

Add the BCM6345 interrupt controller to a list with the existing BCM7038
so that interrupts on CPU1 are not ignored.

Update the maintainers file list for BMIPS to include this driver.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: linux-mips@linux-mips.org
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Rob Herring <robh@kernel.org>
Link: http://lkml.kernel.org/r/5651D176.6030908@simon.arlott.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Simon Arlott 2015-11-22 14:30:14 +00:00 committed by Thomas Gleixner
parent 4b5ce20b54
commit c7c42ec2ba
6 changed files with 380 additions and 2 deletions

View File

@ -2423,6 +2423,7 @@ F: arch/mips/bmips/*
F: arch/mips/include/asm/mach-bmips/*
F: arch/mips/kernel/*bmips*
F: arch/mips/boot/dts/brcm/bcm*.dts*
F: drivers/irqchip/irq-bcm63*
F: drivers/irqchip/irq-bcm7*
F: drivers/irqchip/irq-brcmstb*
F: include/linux/bcm963xx_nvram.h

View File

@ -151,6 +151,7 @@ config BMIPS_GENERIC
select CSRC_R4K
select SYNC_R4K
select COMMON_CLK
select BCM6345_L1_IRQ
select BCM7038_L1_IRQ
select BCM7120_L2_IRQ
select BRCMSTB_L2_IRQ

View File

@ -15,6 +15,12 @@
#include <asm/irq_cpu.h>
#include <asm/time.h>
static const struct of_device_id smp_intc_dt_match[] = {
{ .compatible = "brcm,bcm7038-l1-intc" },
{ .compatible = "brcm,bcm6345-l1-intc" },
{}
};
unsigned int get_c0_compare_int(void)
{
return CP0_LEGACY_COMPARE_IRQ;
@ -24,8 +30,8 @@ void __init arch_init_irq(void)
{
struct device_node *dn;
/* Only the STB (bcm7038) controller supports SMP IRQ affinity */
dn = of_find_compatible_node(NULL, NULL, "brcm,bcm7038-l1-intc");
/* Only these controllers support SMP IRQ affinity */
dn = of_find_matching_node(NULL, smp_intc_dt_match);
if (dn)
of_node_put(dn);
else

View File

@ -78,6 +78,11 @@ config I8259
bool
select IRQ_DOMAIN
config BCM6345_L1_IRQ
bool
select GENERIC_IRQ_CHIP
select IRQ_DOMAIN
config BCM7038_L1_IRQ
bool
select GENERIC_IRQ_CHIP

View File

@ -46,6 +46,7 @@ obj-$(CONFIG_XTENSA) += irq-xtensa-pic.o
obj-$(CONFIG_XTENSA_MX) += irq-xtensa-mx.o
obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o
obj-$(CONFIG_SOC_VF610) += irq-vf610-mscm-ir.o
obj-$(CONFIG_BCM6345_L1_IRQ) += irq-bcm6345-l1.o
obj-$(CONFIG_BCM7038_L1_IRQ) += irq-bcm7038-l1.o
obj-$(CONFIG_BCM7120_L2_IRQ) += irq-bcm7120-l2.o
obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o

View File

@ -0,0 +1,364 @@
/*
* Broadcom BCM6345 style Level 1 interrupt controller driver
*
* Copyright (C) 2014 Broadcom Corporation
* Copyright 2015 Simon Arlott
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This is based on the BCM7038 (which supports SMP) but with a single
* enable register instead of separate mask/set/clear registers.
*
* The BCM3380 has a similar mask/status register layout, but each pair
* of words is at separate locations (and SMP is not supported).
*
* ENABLE/STATUS words are packed next to each other for each CPU:
*
* BCM6368:
* 0x1000_0020: CPU0_W0_ENABLE
* 0x1000_0024: CPU0_W1_ENABLE
* 0x1000_0028: CPU0_W0_STATUS IRQs 31-63
* 0x1000_002c: CPU0_W1_STATUS IRQs 0-31
* 0x1000_0030: CPU1_W0_ENABLE
* 0x1000_0034: CPU1_W1_ENABLE
* 0x1000_0038: CPU1_W0_STATUS IRQs 31-63
* 0x1000_003c: CPU1_W1_STATUS IRQs 0-31
*
* BCM63168:
* 0x1000_0020: CPU0_W0_ENABLE
* 0x1000_0024: CPU0_W1_ENABLE
* 0x1000_0028: CPU0_W2_ENABLE
* 0x1000_002c: CPU0_W3_ENABLE
* 0x1000_0030: CPU0_W0_STATUS IRQs 96-127
* 0x1000_0034: CPU0_W1_STATUS IRQs 64-95
* 0x1000_0038: CPU0_W2_STATUS IRQs 32-63
* 0x1000_003c: CPU0_W3_STATUS IRQs 0-31
* 0x1000_0040: CPU1_W0_ENABLE
* 0x1000_0044: CPU1_W1_ENABLE
* 0x1000_0048: CPU1_W2_ENABLE
* 0x1000_004c: CPU1_W3_ENABLE
* 0x1000_0050: CPU1_W0_STATUS IRQs 96-127
* 0x1000_0054: CPU1_W1_STATUS IRQs 64-95
* 0x1000_0058: CPU1_W2_STATUS IRQs 32-63
* 0x1000_005c: CPU1_W3_STATUS IRQs 0-31
*
* IRQs are numbered in CPU native endian order
* (which is big-endian in these examples)
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/cpumask.h>
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/types.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#define IRQS_PER_WORD 32
#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 2)
struct bcm6345_l1_cpu;
struct bcm6345_l1_chip {
raw_spinlock_t lock;
unsigned int n_words;
struct irq_domain *domain;
struct cpumask cpumask;
struct bcm6345_l1_cpu *cpus[NR_CPUS];
};
struct bcm6345_l1_cpu {
void __iomem *map_base;
unsigned int parent_irq;
u32 enable_cache[];
};
static inline unsigned int reg_enable(struct bcm6345_l1_chip *intc,
unsigned int word)
{
#ifdef __BIG_ENDIAN
return (1 * intc->n_words - word - 1) * sizeof(u32);
#else
return (0 * intc->n_words + word) * sizeof(u32);
#endif
}
static inline unsigned int reg_status(struct bcm6345_l1_chip *intc,
unsigned int word)
{
#ifdef __BIG_ENDIAN
return (2 * intc->n_words - word - 1) * sizeof(u32);
#else
return (1 * intc->n_words + word) * sizeof(u32);
#endif
}
static inline unsigned int cpu_for_irq(struct bcm6345_l1_chip *intc,
struct irq_data *d)
{
return cpumask_first_and(&intc->cpumask, irq_data_get_affinity_mask(d));
}
static void bcm6345_l1_irq_handle(struct irq_desc *desc)
{
struct bcm6345_l1_chip *intc = irq_desc_get_handler_data(desc);
struct bcm6345_l1_cpu *cpu;
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int idx;
#ifdef CONFIG_SMP
cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
#else
cpu = intc->cpus[0];
#endif
chained_irq_enter(chip, desc);
for (idx = 0; idx < intc->n_words; idx++) {
int base = idx * IRQS_PER_WORD;
unsigned long pending;
irq_hw_number_t hwirq;
unsigned int irq;
pending = __raw_readl(cpu->map_base + reg_status(intc, idx));
pending &= __raw_readl(cpu->map_base + reg_enable(intc, idx));
for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
irq = irq_linear_revmap(intc->domain, base + hwirq);
if (irq)
do_IRQ(irq);
else
spurious_interrupt();
}
}
chained_irq_exit(chip, desc);
}
static inline void __bcm6345_l1_unmask(struct irq_data *d)
{
struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
u32 word = d->hwirq / IRQS_PER_WORD;
u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
unsigned int cpu_idx = cpu_for_irq(intc, d);
intc->cpus[cpu_idx]->enable_cache[word] |= mask;
__raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
}
static inline void __bcm6345_l1_mask(struct irq_data *d)
{
struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
u32 word = d->hwirq / IRQS_PER_WORD;
u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
unsigned int cpu_idx = cpu_for_irq(intc, d);
intc->cpus[cpu_idx]->enable_cache[word] &= ~mask;
__raw_writel(intc->cpus[cpu_idx]->enable_cache[word],
intc->cpus[cpu_idx]->map_base + reg_enable(intc, word));
}
static void bcm6345_l1_unmask(struct irq_data *d)
{
struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
unsigned long flags;
raw_spin_lock_irqsave(&intc->lock, flags);
__bcm6345_l1_unmask(d);
raw_spin_unlock_irqrestore(&intc->lock, flags);
}
static void bcm6345_l1_mask(struct irq_data *d)
{
struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
unsigned long flags;
raw_spin_lock_irqsave(&intc->lock, flags);
__bcm6345_l1_mask(d);
raw_spin_unlock_irqrestore(&intc->lock, flags);
}
static int bcm6345_l1_set_affinity(struct irq_data *d,
const struct cpumask *dest,
bool force)
{
struct bcm6345_l1_chip *intc = irq_data_get_irq_chip_data(d);
u32 word = d->hwirq / IRQS_PER_WORD;
u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
unsigned int old_cpu = cpu_for_irq(intc, d);
unsigned int new_cpu;
struct cpumask valid;
unsigned long flags;
bool enabled;
if (!cpumask_and(&valid, &intc->cpumask, dest))
return -EINVAL;
new_cpu = cpumask_any_and(&valid, cpu_online_mask);
if (new_cpu >= nr_cpu_ids)
return -EINVAL;
dest = cpumask_of(new_cpu);
raw_spin_lock_irqsave(&intc->lock, flags);
if (old_cpu != new_cpu) {
enabled = intc->cpus[old_cpu]->enable_cache[word] & mask;
if (enabled)
__bcm6345_l1_mask(d);
cpumask_copy(irq_data_get_affinity_mask(d), dest);
if (enabled)
__bcm6345_l1_unmask(d);
} else {
cpumask_copy(irq_data_get_affinity_mask(d), dest);
}
raw_spin_unlock_irqrestore(&intc->lock, flags);
return IRQ_SET_MASK_OK_NOCOPY;
}
static int __init bcm6345_l1_init_one(struct device_node *dn,
unsigned int idx,
struct bcm6345_l1_chip *intc)
{
struct resource res;
resource_size_t sz;
struct bcm6345_l1_cpu *cpu;
unsigned int i, n_words;
if (of_address_to_resource(dn, idx, &res))
return -EINVAL;
sz = resource_size(&res);
n_words = sz / REG_BYTES_PER_IRQ_WORD;
if (!intc->n_words)
intc->n_words = n_words;
else if (intc->n_words != n_words)
return -EINVAL;
cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
GFP_KERNEL);
if (!cpu)
return -ENOMEM;
cpu->map_base = ioremap(res.start, sz);
if (!cpu->map_base)
return -ENOMEM;
for (i = 0; i < n_words; i++) {
cpu->enable_cache[i] = 0;
__raw_writel(0, cpu->map_base + reg_enable(intc, i));
}
cpu->parent_irq = irq_of_parse_and_map(dn, idx);
if (!cpu->parent_irq) {
pr_err("failed to map parent interrupt %d\n", cpu->parent_irq);
return -EINVAL;
}
irq_set_chained_handler_and_data(cpu->parent_irq,
bcm6345_l1_irq_handle, intc);
return 0;
}
static struct irq_chip bcm6345_l1_irq_chip = {
.name = "bcm6345-l1",
.irq_mask = bcm6345_l1_mask,
.irq_unmask = bcm6345_l1_unmask,
.irq_set_affinity = bcm6345_l1_set_affinity,
};
static int bcm6345_l1_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw_irq)
{
irq_set_chip_and_handler(virq,
&bcm6345_l1_irq_chip, handle_percpu_irq);
irq_set_chip_data(virq, d->host_data);
return 0;
}
static const struct irq_domain_ops bcm6345_l1_domain_ops = {
.xlate = irq_domain_xlate_onecell,
.map = bcm6345_l1_map,
};
static int __init bcm6345_l1_of_init(struct device_node *dn,
struct device_node *parent)
{
struct bcm6345_l1_chip *intc;
unsigned int idx;
int ret;
intc = kzalloc(sizeof(*intc), GFP_KERNEL);
if (!intc)
return -ENOMEM;
for_each_possible_cpu(idx) {
ret = bcm6345_l1_init_one(dn, idx, intc);
if (ret)
pr_err("failed to init intc L1 for cpu %d: %d\n",
idx, ret);
else
cpumask_set_cpu(idx, &intc->cpumask);
}
if (!cpumask_weight(&intc->cpumask)) {
ret = -ENODEV;
goto out_free;
}
raw_spin_lock_init(&intc->lock);
intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
&bcm6345_l1_domain_ops,
intc);
if (!intc->domain) {
ret = -ENOMEM;
goto out_unmap;
}
pr_info("registered BCM6345 L1 intc (IRQs: %d)\n",
IRQS_PER_WORD * intc->n_words);
for_each_cpu(idx, &intc->cpumask) {
struct bcm6345_l1_cpu *cpu = intc->cpus[idx];
pr_info(" CPU%u at MMIO 0x%p (irq = %d)\n", idx,
cpu->map_base, cpu->parent_irq);
}
return 0;
out_unmap:
for_each_possible_cpu(idx) {
struct bcm6345_l1_cpu *cpu = intc->cpus[idx];
if (cpu) {
if (cpu->map_base)
iounmap(cpu->map_base);
kfree(cpu);
}
}
out_free:
kfree(intc);
return ret;
}
IRQCHIP_DECLARE(bcm6345_l1, "brcm,bcm6345-l1-intc", bcm6345_l1_of_init);